Keyence GT series LVDT touch probes - Cincinnati Automation

NEW 

General Purpose Digital Contact Sensor 

GT Series

sensor heads 

Easy set-up 

Compact sensor head 

Resolution 

 

μ 

Shortest in 

its class 

 

 

 

10 mm range 

GT-H10 

Environment resistance 

 

*Excluding low-stress types 

 

 

 

Measuring range 

22 mm range 


amplifiers 

Compact amplifier 

 

 

DIN rail mounting 

amplifier unit 

GT-71A 

Panel mounting 


GT-75A

sensor heads 

Easy set-up 

Compact sensor head 

Resolution 

 

μ 

Shortest in 

its class 

 

 

 

10 mm range 


Environment resistance 

 

*Excluding low-stress types 

 

 

 


22 mm range 


amplifiers 

Compact amplifier 

 

 

DIN rail mounting 



Panel mounting 


GT-75A

Conventional sensor head mounting is prone to short service life due to the excessive tightening force applied by 

a clamping fixture. Insufficient tightening in fear of damaging the head is also a problem. 

 

 

 

 

 

Tightening torque: 10 Nm 

Since the force is concentrated at two points, 

excessive tightening often damages 

the sensor. 

With the Locking collet of the GT Series 

the force is applied from four directions 

which prevents damage and product life reduction. 

 

 

Contact sensors are destined to break due to friction over a long period of use. The GT Series uses linear ball 

bearings in the spindle to achieve a longer service life. 

 

 

There are two types of contact sensors: 

those with and those without ball 

bearings. The use of ball bearings 

greatly increases the service life. 

 

 

The GT Series is water-resistant. This renders the structure effective for long-term use in harsh environments.

Many contact sensors typically use pulse counting methods which can miss data when targets travel at high speeds. 

However, Keyence's use of the co-transformer method to keep track of the contact's absolute position eliminates 

skipped (missing) data. 

 

 

 

 

 

 

 

 

 

The signal level changes according to the position of the spindle inside the coil. 

The double-coil structure allows comparison of two signals to eliminate errors. 

 

3.54" 

90mm 

 

 

Total length 

3.54" (90mm) 

The 10-mm range 

head is the shortest 

in its class at only 

90 mm (3.54"). 

secondary 

coil 

 

 

The primary coil and 

the secondary coil are 

arranged in series. 

Primary coil 

Core 

 

 

The detection coil 

and the adjustment 

coil sorround each 

other. 

Adjustment coil 

Detection coil 

 

The co-transformer method does not require troublesome adjustments. 

 

The co-transformer method and high-performance magnetic shield structure prevent mutual interference from units 

that are close together.

Featuring 3 digital comparator outputs (HI, LO and GO), the GT series can be lower case in minutes, not hours. 

Pushbutton calibration will leave you asking yourself why you hadn't switched to the GT sooner. 

 

 

 

 

 

Forget about the tedious PLC programming that you're used to with your existing LVDT's. The GT does the work for you. 

In addition, you can save money by eliminating the analog I/O card from your budget. 

 

 

 

Display Analog card PLC programming 

 

 

 

 

 

Using channel select inputs on the GT-70A, users can easily toggle between up to 4 different sets of HI/LO limits. You 

can even use your existing HMI, while clearing out the cobwebs of PLC programming running behind the scenes.

Unlike conventional amplifiers, this amplifier does not require a large mounting space. The LED display is brighter, 

and easier-to-read than conventional LCD indicators. 

 

Panel mounting type 

amplifier 


 

 

 

This amplifier can easily be mounted in the desired position by using a DIN-rail or the optional bracket. 

DIN-rail mounting type 

amplifier 


 

 

Since the numerical display updates slower 

than the internal detection, you can check 

the status of fast moving parts easily by 

monitoring the bar indicator. 

See the status of non-defective products 

from bar indicator. 

Maintenance 

Maintenance 

Normal 

required 

required 

HI borderline Stable detection LO borderline 

 

 

 

Installation of expansion units enables communication 

between sensor heads for various calculations. 

 

Expansion units can be powered by the main unit. As a 

result, fewer wires need to be connected during setup, 

making for a quicker, neater installation. 

The DIN rail mounting amplifier units can 

be joined together by simply using the 

connector on the side of the unit. 

The panel mounting 

amplifier units require a flat 

cable for communication. 

 

 

Panel mounting amplifier units can be 

vertically mounted closely together.

The sensor head has a bright, two-color indicator. The light illuminates in red when the result is NG, which ensures 

easy recognition of problematic points. 

 

 

Operators can visually determine the state in which the products are nearing the NG limits. For example, when the 

height of the target is nearing the NG line, the green segments in the bar indicator decrease. Although it is difficult to 

recognize this state by reading numerical values, the bar indicator shows it clearly. Corrective measures can be 

taken before defective products are produced. 

 

 

 

 

 

The peak value of each detection can be held for an easy visual check. Since the indicator unit is separate from the 

detection unit, it can be mounted in any easy-to-see location.

An locking collet specifically designed for the GT Series is available, eliminating the need to prepare a clamping 

fixture. The sensor can be easily mounted simply by drilling a 10mm diameter hole. 

OP-76874 

Head mounting bracket A 

(Optional) 

OP-76875 

Head mounting bracket B 

(Optional) 

Side-mountable 

 

 

 

 

The amplifier is designed for simple and easy operation with the RIGHT/LEFT buttons for menu selection and the 

UP/DOWN buttons for value specification. 

 

 

 

 

Select a menu 

with the buttons. 

Specify values 

with the buttons. 

 

 

The indicator for the sensor head currently 

being set will blink, letting you know at a glance 

which of several heads is being set. (Patent 

pending) 

 

 

 

 

 

 

 

Unlike conventional calculations, which were done with a PLC using recorded data, calculations such as thickness 

and degree of flatness are automatically done by the sensor head. Simply select the proper application mode. 

Maximum Minimum Degree of Average Reference Twist Warpage Thickness 

flatness 

difference

Since the co-transformer method keeps track of the absolute position, 

the zero point position is retained even after the power is turned off. Once the zero point is adjusted, 

it is not necessary to adjust it again. 

 

 

 

 

BCD output unit 

DL-RB1 

RS-232C communication unit 

DL-RS1 

 

 

 

 

The DL-RB1 allows a PLC or other external device to read 

detection data for the specified amplifier. 

The DL-RS1 allows a PLC, PC, or other external device to 

read the detection or setting data for an amplifier or the 

calculation result of the data for several amplifiers, as well 

as to write setting data into an amplifier.

In the event of core 

damage, or contamination, 

the core may stick, or 

remain compressed. This 

function outputs an alarm if 

the core does not return to a 

home position. This 

preventive maintenance 

alarm helps to eliminate 

downtime and to minimize 

scrap and rework. 

Head does 

not return! 

Alarm 

output 

Outputs an alarm when 

the head cable is 

broken. 

Break! 

Alarm 

output 

 

Simply press the SET button to calibrate the unit. 

 

Setting the tolerance is as easy as pressing the SET button 

on a master workpiece and setting the width ( mm). 

 

Pressing the SET button once each on an OK 

and NG workpiece sets the detection value. 

HI set value 

LO set value 

HI set value 

LO set value 

SET 

HI set 

value 

SET 

SET 

LO set 

value 

SET 

SET 

Master 

workpiece 

NG 

workpiece 

OK 

workpiece 

OK 

workpiece 

NG 

workpiece 

 

 

When the preset timing level is exceeded, the selftiming 

function prepares for comparison. 

 

After the self-timing level is exceeded, the static hold 

function automatically detects when head oscillation 

has stopped and issues a comparator output. 

Compared with conventional sensors, this function 

can greatly increase tact time.(* Optional delay time can 

also be set as desired.) 

Displayed 

value 

Self-timing 

level 

GT 

Series 

Conventional 

models 

0 

Contact with a workpiece 

Comparator output 

Time until oscillation stops 

Conventional delay time 

Time

10-mm range, 

Air push model 

sensor head 

GT-A10 

22-mm range, 

Air push model 

sensor head 


 

 

Target 

 

 

 

 

 

 

 

 

 

To maintain the IP67 rating, it is 

necessary to attach an air tube to 

prevent the entry of water through the 

air outlet port. 

 

 

 

The speed controller (optional) 

allows the spindle movement 

speed to be adjusted. 

Speed controller 

OP-82133

The spring reduces the force 

applied by contact, reducing the 

damage potential to the target. 

(A fluorine plastic contact is also 

available.) 

10 mm range, 

low-stress sensor head 

GT-H10L 

22 mm range, 

low-stress sensor head 


 

 

 

 

 

 

 

The low-stress sensor head 

with a fluorine plastic 

contact prevents scratches 

on the PC board. 

The low-stress sensor head 

prevents deformation of a 

lightweight target. 

 

 

 

Select a contact to suit your application. 

Easier wiring is possible as a relay amplifier is not needed. 

Standard 

Flat plate 

Roller 

 

Needle Super-tough Ceramic 

 

Fluorine plastic Offset Spacer 

* The standard contact is factory-attached to the sensor head.

Single head 

Multiple heads/when additional amplifier units are installed (Application modes) 

STD 

P-H B-H P-P Maximum Minimum Degree of Average Reference Twist Warpage Thickness 

flatness 

difference 

Standard Peak hold Bottom hold Peak to peak 

 

Rivet height 

differentiation 

Outputs HI, GO, 

and LO according 

to rivet height. 

 

Insertion depth 

The self-timing 

function enables 

you to detect 

insertion depth 

without a timing 

input. 

 

Packing insertion 

check 

Confirms that 

targets are properly 

seated. 

 

Shaft inclination 

detection 

Ensures proper 

alignment. 

Warpage 

Board warpage 

detection 

Degree of 

flatness 

Confirms if 

workpiece warpage 

falls within 

acceptable limits. 

Workpiece flatness 

Confirms if workpiece 

flatness falls within 

acceptable limits.

Reference 

difference 

Determining pin 

height 

Checks If pin 

height is within the 

specified range of 

a reference 

surface. 

Twist 

Detecting twist 

Judges if 

workpiece twisting 

falls within 

acceptable limits. 

Thickness 

Shaft diameter 

measurement 

Reference 

difference 

Gasket number 

check 

Differentiates if the 

difference from the 

reference head is 

within a specified 

range. 

Input /Output Circuits 

I/O circuit GT-71/ 72 / 75/76 

External Input circuit 

Main circuit 

Main circuit 

Overcurrent 

protection circuit 

I/O circuit 

I/O circuit GT-71P/72P/75P/76P 

Overcurrent 

protection circuit 

Input circuit 

Brown*1 

Black (HI output) 

Load 

White (LO output) 

Load 

Gray (GOoutput) 

Load 

Blue*1 

Pink, purple ,Pink/purple*3 

Brown*1 

Black (HI output) 

White (LO output) Load 

Gray (GO output) 

Load 

Load 

Blue*1 

Pink, purple ,Pink/purple*3 

12 to 24 VDC*2 

5 to 40 VDC 

5 to 40 VDC 

5 to 40 VDC 

0 V 

External Input 

12 to 24 VDC*2 

0V 

External Input 

Main circuit Main circuit 

Pink: Preset input 

Purple: Bank A input 

Pink/purple: Bank B input/timing input switching 

Blue*1 

(Short-circuit current: 1 mA or less) 

External Input circuit 

Brown*1 

12 to 24 VDC 

Pink: Preset input 

Purple: Bank A input 

Pink/purple: Bank B input/timing input switching 

(Short-circuit current: 2 mA or less) 

*1 Brown and blue are applicable only to main units (GT-71/71P/75/75P), not to expansion units (GT-72/72P/76/76P). 

*2 At expansion, 12 VDC changes to 24 VDC. 

*3 For details on external input, see the External Input Circuit Diagram.

Product lineup 

■ Sensor heads 

■ Amplifier units 

Type 

Standard Air push models Low-stress 

Model 







Shape Measuring range 

Model 

Shape Type Output type 

0.39" 

10 mm 

0.87" 

22 mm 

0.39" 

10 mm 

0.87" 

22 mm 

0.39" 

10 mm 

0.87" 

22 mm 



GT-71AP 






BCD output unit/RS-232C communication unit 

DIN rail 

mounting 

Panel 

mounting 

Main unit 

Expansion unit 

Main unit 


Main unit 


Main unit 


Model Shape Type 

DL-RB1 

DL-RS1 

BCD 

RS-232C 

NPN 

PNP 

NPN 

PNP 

■ Contacts 

■ Optional 

Standard 

(Iducled with all heads)* 

OP-77678 

Flat plate 

(Optional) 

OP-77679 

Roller 

(Optional) 

OP-77680 

Head mounting bracket A 

(Optional) 

OP-76874 


(Optional) 

OP-76875 

Panel mounting bracket 

(Included with panelmountable 

amplifier units) 

OP-76876 

Needle 

(Optional) 

OP-77681 

Fluorine plastic 

(Optional) 

OP-80228 

Super-tough 

(Optional) 

OP-77682 

Offset 

(Optional) 

OP-77683 

* The standard contact is factory-attached to the sensor head. 

Ceramic 

(Optional) 

OP-81970 

Spacer 

(Optional) 

OP-77684 

Fixture for fastening the 

DIN amplifier 

(Optional) 

OP-76877 

Dust boot 

(attached to sensor head)* 

OP-78041 

(for GT-H10/A10) 

End unit (2 per pack) 

(Optional) 

OP-26751 

* Dust boot is not included with the GT-H10L/H22L 

Dust boot 

(attached to sensor head)* 

OP-78042 



(for spindle movement adjustment) 

(Optional) 

OP-82133 

Specifications 

■ Sensor head 

Model 


Mechanical response frequency 

Repeatability 1. 

Measuring force 2. 

Environmental 

resistance 

Enclosure rating 

Materials 

Weight (with 2-m cable) 

Ambient temperature 

Relative humidity 


10 Hz 

(at ambient temperature of 73°F (23°C)) 

When installed facing down: 1.0 N 

When installed sideways: 0.9 N 

When installed facing up: 0.8 N 

IP67 

0.39" 10 mm 

0.12 Mil 3 μm 



7 Hz 






8 Hz 





0.87" 22 mm 

0.31 Mil 8 μm 


14 to 131°F (-10 to +55°C) 

35 to 85% 

- 

IP67 

Housing: TYPE430 Stainless steel, Indicator: Polyarylate, Dust boot 3.: NBR, Contact: TYPE304 stainless steel, Cable: PVC 

Approx.115 g 

Approx.135 g 


5 Hz 





- 

1. Value read at the center of the measuring range with the response time set to 100 ms. 

2. Value read near the center of the measuring range 

3. Dust boot is not included with the GT-H10L/H22L 

Sensor head (Air push models) 

Model 


Repeatability 1. 


0.39" 10 mm 

0.12 Mil 3 μm 



0.87" 22 mm 

0.31 Mil 8 μm 


Measuring force 2. 

Environmental 

resistance 



Enclosure rating 

Operating pressure range 

Withstanding pressure 

Material 

Weight (with 2-m cable) 







32 to 131°F (0°C to +55°C) 

35 to 85% 

IP67 3. 

0.35 to 0.5 MPa 

1.0MPa 

Housing: TYPE430 stainless steel, Cylinder: Aluminum alloy, Plastic section of air joint: Polyacetal, Metal section of air joint: Nickel-plated brass, 

Indicator: Polyarylate, Dust boot: NBR, Contact: TYPE304 stainless steel, Cable: PVC 

Approx.150 g 

Approx.180 g 

1. Value read at the center of the measuring range at ambient temperature of 73°F(23°C) with the response time set to 100 ms. 

2. Value read near the center of the measuring range when the sensor head is installed downward. 

3. To ensure you achieve the rating, connect the air tube to the air outlet joint and prevent foreign matter from entering it through the joint.

■ Amplifier 

NPN 

Model 

PNP 

Mounting method 

Main unit/ Expansion unit 2. 

Power supply voltage 3. 



Main unit 

DIN rail mount 1. 






Main unit 

12 to 24 VDC, ripple (P-P) 10% or less 

Panel mount 




Power consumption 

Normal 

Power saving (eco) 

At 12 V 

1140 mW (95 mA) or less 


At 24 V 



Display method 

Display range 

Display resolution 

Sampling rate 

Main functions 

Timing input 

Control input Preset input 

Bank input 

HIGH, GO, LOW output 

Response time 

Environmental 

resistance 

Materials 

Weight 

Accessories 

Measured value display 

Other displays 



Vibration 

6-digit 7-segment LED (red) 

2-color 13-level bar LED display (red, green), indicators (red, green) 

-99.999 to 999.999 

0.039Mil 1 μm 

2000 times/second 

Preset, Hold, Variable hysteresis, Variable response time, Multiplier setting, Bank function (4 banks), 

Self-timing, Power save (eco) mode, Application mode, Calibration function, Core alarm 

Non-voltage input (relay contact, solid state), input time: 2 ms or more 

Non-voltage input (relay contact, solid state), input time: 20 ms or more 

NPN (PNP) open collector, 50 mA max. (NPN: 40 V or less, PNP: 30 V or less), residual voltage: 1 V or less, N.O./N.C. switchable 

hsp (1.5 ms) , 5 ms, 10 ms, 100 ms, 500 ms, 1 s, 5 s 

14 to 131°F (-10 to +55°C) 

35 to 85% (No condensation) 

10 to 55 Hz, double amplitude: 1.5 mm, 2 hours in each of X, Y, and Z directions 

Main body case: Polycarbonate, Key top: Polyacetal, Front sheet: Polycarbonate, Cable: PVC 

GT-71A(P), GT-72A(P): Approx. 110 g (including the power cable) 

GT-75A(P), GT-76A(P): Approx 110 g (including panel mounting bracket, protective front cover, power cable) 

GT-71A(P), GT-72A(P): instruction manual 

GT-75A(P): Panel mounting bracket, protective front cover, power cable, instruction manual 

GT-76A(P): Panel mounting bracket, protective front cover, power cable, flat cable for expansion, instruction manual 

1. Be sure to mount the DIN rail mounting amplifier on a DIN rail (i.e. the unit should be mounted on the metal DIN plate itself). 

For additional amplifier unit installation, be sure to use the end unit (OP-26751). 

2. One main unit and nine expansion units (ten in total) can be additionally installed. 

For additional amplifier unit installation, each output current must be 20 mA or less. 

3. If additional amplifier units are installed, the power supply voltage is 24 VDC. 

Communication unit (common specifications) 

Model 

DL-RB1 

DL-RS1 

Type 

BCD 

RS-232C 

Power supply voltage 

24 VDC Ripple (P-P) 10% max. (supplied from the connected amplifier) 

Current consumption 

20 mA max. 

18 mA max. 

No. of connectable amplifiers 

10 units max. (including the main unit) 

Indicator 

Environmental 

resistance 

Material 

Weight 

Accessory 



Vibration 

Alarm indicator (Red), 

Power indicator (Green) 

Communication status indicator (Green x 2), 

Alarm indicator (Red), 

Power indicator (Green) 

14 to 131°F (-10 to +55°C) 

35 to 85% 

10 to 55 Hz, double amplitude: 1.5 mm, 2 hours each in the X, Y and Z axis 

Housing: Polycarbonate 

Approx. 46 g 

Approx. 53 g 

Instruction manual, End unit (2 pcs.), 

Switch protection sticker, Expansion connector cover 

Communication unit (Communication specifications of DL-RS1) 

Model 

Communication method 

Synchronization 

Transmission code 

Baud rate 

Data length 

Parity check 

Stop bit length 

Delimiter 

DL-RS1 

Full duplex 

Start-stop 

ASCII 

Selectable from 2400, 4800, 9600, 19200, 38400 bps 

(Factory setting: 9600 bps) 

Selectable from 7 bits or 8 bits 

(Factory setting: 8 bits) 

Selectable from none, even, odd 

(Factory setting: None) 

1 bit 

Receive: CR or CR+LF (Automatically recognized) 

Send: CR+LF (Fixed) 

*Only amplifiers with a model name suffixed with an A can be connected. 

Pin assignment of DL-RB1 (BCD output) 

I/O circuit diagram

Dimensions 

Unit : inch mm 

Sensor head 

0.39" 10 mm range GT-H10 

Air push models sensor head 

0.39" 10 mm range GT-A10 

Low-stress sensor head 

0.39" 10 mm range GT-H10L 

2x¿0.10" ¿2.5 

2-core shielded 

Cable length(6.6' 2m) 

0.88" 

22.4 

0.47" 

12 

2x¿0.10" ¿2.5 



0.88" 

22.4 

Quick-connect joint for air inlet 

(for air tube with 0.16" 4-mm outer diameter) 

Quick-connect joint for air outlet 

(for air tube with 0.10" 2.5-mm inner diameter) 

2x¿0.10" ¿2.5 



0.88" 

22.4 

0.47" 

12 

1.89" 

48 

1.89" 

48 

0.55" 

*1 *1 

14 

30.2 1.19" 26.4 1.04" 

to to 

41.7 1.64" 37.9 1.49" 

0.15" 

3.8 

0.24" 

6 

(0.65") 

(16.4) 

¿0.31" ¿8 

+0 

h5 (-0.0002") 

+0 

-0.006 

( ) 

¿0.16" 

¿4 

*1 *1 

30.6 1.21" 26.8 1.01" 

to to 

41.7 1.64" 37.9 1.49" 

1.89" 

48 

0.55"14 

0.47" 

12 

(4.28") 

(108.7) 

0.48" 0.06" 1.4 

12.1 

0.71" 18.15 

1.71" 

43.4 

*1 *1 

30.2 1.19" 

to 

41.7 1.64" 

26.4 1.04" 

to 

37.9 1.49" 

0.15" 

3.8 

0.55" 

14 

0.24" 

6 

(0.65") 

(16.4) 

¿0.31" ¿8 

+0 

-0.0002" 

+0 

-0.006 

h5 ( ) 

( ) 

¿0.16" 

¿4 

0.24" 

0.15" 6 

3.8 

(0.65") 

(16.4) 

¿0.31" ¿8 

+0 

-0.0002" 

+0 

-0.006 

h5 ( ) 

( ) 

¿0.16" ¿4 

0.24" 6 

0.47" 12 

0.87" 22 mm range GT-H22 

0.87" 22 mm range GT-A22 

0.87" 22 mm range GT-H22L 

2x¿0.10" ¿2.5 



0.88" 

22.4 

0.47" 

12 

2x¿0.10" ¿2.5 



0.88" 

22.4 

Quick-connect joint for air inlet 

(for air tube with 0.16" 4-mm outer diameter) 

Quick-connect joint for air outlet 

(for air tube with 0.10" 2.5-mm inner diameter) 

2x¿0.10" ¿2.5 



0.88" 

22.4 

0.47" 

12 

2.83" 

72 

0.47" 

12 

2.83" 

72 

0.75" 

19 

*1 *1 

40.3 1.59" 36.5 1.44" 

to to 

64.8 2.55" 61 2.40" 

0.15" 

3.8 

0.24" 

6 

(0.65") 

(16.4) 

¿0.31" ¿8 

+0 

h5 (-0.0002") 

+0 

h5 (-0.006 

) 

*1 These values indicate the movable range. 

The sensor head cable cannot be cut or extended. 

¿0.16" 

¿4 

*1 *1 

41.1 1.62" 37.3 1.47" 

to 

to 

64.8 2.55" 61 2.40" 

0.15" 

3.8 

2.83" 

72 

0.75" 19 

0.24" 

6 

(0.65") 

(16.4) 

¿0.31" ¿8 

+0 

-0.0002" 

+0 

-0.006 

h5 ( ) 

( ) 

0.48" 

12.1 

0.24" 6 

0.06" 1.4 

0.71" 18.15 

¿0.16" ¿4 

(5.37") 

(136.5) 

2.19" 

55.7 

0.47" 12 

*1 *1 

40.3 1.59" 

to 

64.8 2.55" 

36.5 1.44" 

to 

61 2.40" 

0.15" 

3.8 

0.75" 

19 

0.24" 

6 

(0.65") 

(16.4) 

¿0.31" ¿8 

+0 

-0.0002" 

+0 

-0.006 

h5 ( ) 

( ) 

¿0.16" 

¿4 





Head mounting bracket A OP-76874 (Optional) 

¿0.39" ¿10 

+0.0002" 

G6( +0.0006" ) 

+0.005 

G6( +0.014 ) 

C0.06" 

C1.5 

0.47" 0.47" 

12 12 R0.26" 

R6.5 

¿0.31" ¿8 

+0.001" 

G6( +0.0002" ) 

+0.027 

+0.005 

0.14" 

3.5 

( ) +0.001" 

+0.0002" 

+0.027 

( ) 

6 0.24" 0.64" 

7.8 0.31" 16.3 

Mounting hole 

C0.02" to C0.04" 

C0.5 to C1.0 

¿0.39" ¿10 

G8( ) 

+0.005 

0.22" to 0.44" 

5.5 to 11.3 

0.64" 

16.3 


OP-76875 (Optional) 

0.41" 

10.5 

(0.008") 

(0.2) 

0.43" 

11 

0.25" 

6.3 

R0.15" 

R3.8 

1.26"32 

12.1 

0.59" 

15 

R0.31" 

R8 

0.26" 

6.5 C0.08" 

4xC2 

¿0.17" 

¿4.2 

0.14" 

3.5 

Dust boot 

(Included) 

OP-78041 


0.86" 

21.8 

¿0.30" 

¿7.6 

Material:NBR, 

TYPE304 stainless steel 

Dust boot 

(Included) 

OP-78042 


1.57" 

40 

¿0.30" 

¿7.6 

0.26" 

6.5 


(Optional) 

OP-82133 

0.80" 

20.4 

0.55" 

14 

¿0.13" 

2-¿3.2 

0.59" 

14.9 ¿0.41" 

0.80" ¿10.5 

20.4 

¿0.16" 

2-¿4 

0.43" 

11 

0.76" 1.13" 

19.4 28.6 

0.26" 

6.5 

Material:TYPE304 stainless steel 

¿0.31" ¿8 

+0.0006" 

+0.0002" 

+0.014 

G6( )( +0.005 ) 

Material:NBR, 

TYPE304 stainless steel 

Material:NBR, 

stainless steel,POM,Brass,PBT,Aluminum 

Material:TYPE304 stainless steel, Zinc

Contact 

Standard 

(Included with all 

heads)* 3 

OP-77678 

0.15" 3.8 

0.20" 5 

¿0.20" ¿5 

SR 0.06" 1.5 

M 2.5 x 0.02" 0.45 

Material:TYPE304 stainless steel,TYPE440C stainless steel 

*3 The standard-type contact is attached to a head 

when shipped. 

Flat plate 

(Optional) 

OP-77679 

0.18" 

4.5 

0.20" 5 

¿0.28" 

¿7 

¿0.24" 

¿6 


Super-tough tungsten alloy 

0.35" 

0.17" 0.16" 9 

4.4 4 

Roller 

(Optional) 

OP-77680 

0.18" 4.5 

¿0.35" 

¿9 

0.30" 7.5 

0.14" 

0.37" 9.5 3.5 

¿0.30" 

¿7.5 

¿0.35" 

¿9 


TYPE440C stainless steel 

M 2.5 x 0.02" 0.45 

Needle 

(Optional) 

OP-77681 

0.83" 

21 

0.24" 

6.2 

¿0.16"¿4 

¿0.05" ¿1.2 

C0.008" 

C 0.2 

M 2.5 x 0.02" 0.45 

0.20" 5 



Super-tough 

(Optional) 

OP-77682 

0.15" 3.8 

0.20" 5 

¿0.20" ¿5 

SR0.06" 1.5 

M 2.5 x 0.02" 0.45 



Ceramic 

(Optional) 

 

0.15" 

3.8 

¿0.20" ¿5 

SR 0.06" 1.5 

Fluorine plastic contact 

(Optional) 

 

¿0.20" ¿5 

0.35" 

9 

SR 0.06" 1.5 

Offset 

(Optional) 

OP-77683 

¿0.06" 

¿1.6 

SR0.03" 0.8 

0.79" 

20 

5 0.20" 

0.39" 

10 

0.14" 

3.5 

Spacer 

(Optional) 

OP-77684 

0.14" 

3.6 

12.2 0.48" 

0.08"2 

¿0.16" ¿4 

M2.5 x 0.02" 0.45 

Effective screw depth:0.26" 6.5 

0.20" 

5 

M 2.5 x 0.02" 0.45 

Material:SUS304,Ceramic 

0.20" 

5 

M 2.5 x 0.02" 0.45 

Material: Fluorine plastic (PTFE) 

8 0.31" 

¿0.24" 

M 2.5 x 0.02" 0.45 

¿6 ¿0.30"¿7.5 

Material:TYPE304 stainless steel,Super-tough tungsten alloy 

0.22" 

5.5 


M 2.5 x 0.02" 0.45 

Amplifier unit (DIN rail mount) 

GT-71A/ 71AP 

24 0.94" 

15 0.59" 

max.135¡ 

1.46" 

1.65" 

37 

42 

18 0.71" 

min. 0.49" 

0.59" 12.4 

15 

0.12" 

3 

0.83" 

21.1 

Amplifier unit (Panel mount) 

GT-75A/ 75AP/ 76A/76AP 

1.76" 

44.7 0.64" 

16.3 

*4 0.49" 12.5 

1.39" 

35.4 

2.76" 70 

2.04" 

51.8 

0.27" 

6.8 

0.46" 

11.6 

GT-72A/ 72AP 

0.94" 

24 

0.59"15 

0.12" 

3 

X 

11.6 0.46" 

1.77"45 

0.20" 

5 

X=0.94" x (A-0.04")+0.83" 

X=24 x (A-1)+21 

When A amplifier units 

are closely mounted 

2.48" 63 min. 

0.59" 2x¿0.13" ¿3.4 

15 

(0.17" x 0.13") 

2x(4.4 x 3.4) 

(Maximum when 

the cover is 

opened) 

*4 3.11" 79 1.65" 1.46" 

0.94" 0.87" 

42 

37 

*4 24 22 

0.69" 17.6 

0.71" 18 

0.69" 17.6 

0.59" 

15 

min. 0.49" 0.83" 1.39" 

1.13" 

12.4 21.1 35.4 

28.6 

min. 

0.59" 

min. 

2.76" 70 

1.38" 

0.59" 

15 

0.59" 

35 

15 

15 


*4 Cable specifications 

(common to all amplifier units) 

¿0.17" ¿4.2, 8-core x 

Brown/Blue/Black/Gray/Pink/ 

Pink purple/Purple/White 

:0.26 mm 2 Cable length:6.6' 2m 

(for GT-71A/ 71AP/ 75A/ 75AP) 

¿0.17" ¿4.2, 6-core x 

Black/Gray/Pink/ 

Pink purple/Purple/White 

:0.26 mm 2 Cable length:6.6' 2m 

(for GT-72A/ 72AP/ 76A/ 76AP) 

Panel mounting bracket (Accessory) 

OP-76876 

1.93"49 

1.53" 

38.8 

0.94" 

24 

Panel cutout 

Fixture for fastening the 

DIN amplifier 

(Optional) 

OP-76877 

(2.87") (73) 

0.24" 6 

(0.89") 

(22.6) 

DIN-rail mounting 

0.82" 

20.8 

Panel mounting bracket 

End unit (Optional)(2 per pack) 

OP-26751 

0.36" 

9.2 

0.44" 

11.1 

1.39" 

35.4 

2.12" 

53.8 

Material: Polycarbonate, stainless steel 

Panel thickness: 

0.04" to 0.24" 

1to6 

0.06" 

1.6 

2.36" 

60 

0.09" 

2.3 

Communication unit 

BCD output type DL-RB1 

0.94" 

24 

When mounted to a DIN-rail 

0.89" 22.5 

0.26" 

6.6 

0.49" 

12.4 

min. 

0.59" 

15 

0.83" 21 

0.53"13.4 

0.14" 

3.5 

Protective front cover 

When a mounting bracket is used 


2.44"62 

0.94" 

23.8 

0.42" 

10.7 

+0.02" 

0.83" -0 

+0.4 

21 -0 

Material: (Mounting bracket), polyacetal 

(Protective front cover) polycarbonate 

0.89" 22.5 

1.77"45 

As for the expansion of the panel mounting type amplifier, connecting the main 

and expansion units is possible only in the vertical-mounting position. 

When connecting the units in the horizontal-mounting position, use the main units only. 

RS-232C communication type 

When mounted to a DIN-rail 

When a mounting bracket is used 


(2.28") 

(57.8) 

2.10" 

53.4 

1.46" 

37.1 

2.40" 

60.9 

2.10" 

53.4 

1.46" 

37.1 

(1.90") 1.47" 

(48.2) 37.2 

1.72" 

43.8 

2.02" 1.47" 

51.3 37.2 

1.72" 

43.8 

0.83" 

21.1 

1.39" 

35.4 

2.76" 70 

1.24" 0.59" 

31.4 15 

2.76" 70 

¿0.13" 

2-¿3.4 

0.83" 

21.1 

1.39" 

35.4 

2.76" 70 

1.24" 0.59" 

31.4 15 

2.76" 70 

¿0.13" 

2-¿3.4 

0.89" 22.5 

(0.17" x 0.13") 

2-(4.4 x 3.4) 

0.89" 

22.5 

(0.17" x 0.13") 

2-(4.4 x 3.4) 

0.57" 

15 

1.12" 

28.5 

1.40" 

35.5 

Material: 

Stainless steel 

0.59" 

15 

1.12" 

28.5 

1.40" 

35.5 

Material: 

Stainless steel

Related products 

High-speed, High-accuracy CCD Laser Displacement Sensor 

LK-G Series 

Ultra-high speed 

50 kHz 

High accuracy 

±0.02% 

Wide measuring range 

0.35" to 39.37" 9 to 1000 mm 

Various types of measuring heads 

6 types 

■ Applications 

Measuring the thickness of a silicon wafer Measuring the thickness of a glass plate Measuring the runout of a disk rotor Measuring the height of a jet solder bath 

Specifications are subject to change without notice. 

CALL 

TOLL 

FREE 

TO CONTACT YOUR LOCAL OFFICE 

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Fax : 201-930-0099 

KEYENCE CORPORATION OF AMERICA 

Corporate Office 50 Tice Blvd., Woodcliff Lake, NJ 07677 Phone:201-930-0100 Fax:201-930-0099 E-mail:keyence@keyence.com 

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KA1-0066 

© KEYENCE CORPORATION, 2006 GT-KA-C-E 0116-1 000693 Printed in Japan

Keyence GT series LVDT touch probes - Cincinnati Automation

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